Grinding mill for rocks, ores, and like material



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GRINDING MILL FOB ROCKS,

GEES, AND LIKE IZEATEBIAL.

Application filed June 18, 1919. Serial No. 305,123.

To all in 710m it may concern Be it i .own that .l, ED'WARD H. MoYLn, a citizen of the United States, residing at Los Angeles, in the county or" Los Angeles and State of California, have invented a certain new and useful Improvement in. Grinding Mills for Rocks, Ores, and like Material, of which the following is a specification.

This invention relates to grinding mills for reducing hard materials such as ore, lime rock, clinker or the like to a. fine mesh product.

Objects of this invention are to provide a device which will operate nearly in balance, requiring about the same amount of power to start the device as to operate; to provide a simple device made of the fewest number 0t parts to give a result; to provide a device" which will readily disassociate a compact mass when starting; to provide a. device in which a more direct wearing contact surface of the grinding elements will be on the ore, rock or material to be pulverized; to provide a device for quickly unloading or discharging the product when it is pulverized, and finally to provide a device in which the grinding parts can be readily and quickly renewed.

Vith these and other objects in view, this invention consists of the features, and arrangement oi parts, separately and in com bination, described in connection with the accompanying drawings, and then more particularly pointed out in the claims.

In the drawing,

Fig. 1 is a plan view when assembled.

Fig. 2 is a side elevation of the grinding mill as assembled, and partly shown in section through the centre of drum and discharge tube bearing. and delivery tube, as on the lines A-A of Fig. 1, but, showing the driving gear and mechanical intake scoop in elevation, the mechanical feed box in section, and the pinion drive shaft, pinion and their drive parts removed for clearness in description.

Fig. 3 is a sectional detail through the centre oi grinding mill, on lines. B-B of Fig. 9, and, on lines E-E of Fig. 1, the drive gear,

of the grinding mill pinion and pulley shown in outline, while other parts are removed for clearness in description.

Fig. 4: is a sectional detail through the centre of grinding mill, on lines BB of Fig. 2, and, on lines EE of Fig. 1, the drive gear, pinion, pulley and other parts not being shown. Fig. l shows a modification of the roll or rotor ring. shoe in section, within the mill.

Fig. 5 is a sectional detail through the centre of grinding mill, on lines B-B of Fig. 2-, and, on lines EE of Fig. 1, the drive gear, pinion, pulley and other parts not being shown. This figure also shows a modification of the roll, or rotor ring shoe, as explained, the roll shoe being solid, is not drawn in section.

Fig. 6 is also a sectional detail through the centre of grifiding mill, on the lines P -B 0:" Fig. 2, and on 1inesE-E of Fig. 1, the drive gear, pinion, pulley and other parts not being shown for clearness, this figure also shows a modification of the roll or rotor ring shoe, drawn in section, and show ing lifting vanes, projections, flights or extensions arranged on its inner periphery, or inner concave surface, the object being to carry the crushed fines upwardly in the :ir cular movement of the mill and so unload or discharge them into the discharge tube, to be carried out of the mill.

Fig. 7 is a sectional side elevation of the grinding mill, drawn on the lines A-A. of Fig. 1, the roll or rotor ring shoe as shown in Fig. 6, being drawn in section. The delivery tube and the discharge tube are shown projecting inwardly of the grinding mill to more quickly feed and unload or discharge the finely crushed product of the mill.

Fig. 8 is a sectional side elevation of the discharge tube shown in Fig. 7, but drawn to a larger scale, in order that my description of the discharge launder may be more clearly understood.

Fig. 9 is a sectional detail through the centre of grinding mill on the lines E-E of Fig. 1, and showing a roll or rotor ring shoe supported by double conical friction rollers which are carried between the roller face or tread of the roll, or rotor ring shoe and the roll race or tread of the die.

Fig. 10 is a sectional detail in elevation through the centre of grinding mill on the lines A.-A of Fig. 1, and also shows the,

roll 01;. rotorring shoe, having double conical friction rollers, and also the ,die for the double conical friction rollers in this figure is also shown the delivery tube and the discharge tube projecting inwardly of the mill.

Fig. 11 shows another form of roller which may be used.

.Fig. 12 is an end view shown in Fig. 11. I

Fig. 13 is shown another form of roller which may be used.

Fig. 1 1 is an end view of the roller shown in Fig. 18.

Fig. 15 is a sectional detail through the centre of grinding mill on the lines EE of Fig. 1, but showing a roll or rotor ring shoe supported by balls which are carried in the ball tread of die.

. Fig. 16 is a sectional detail in elevation through'the centre of grinding mill on the lines AA of Fig. 1, it shows the roll or of that roller rotor ring shoe having a ball race or tread to suit the balls, and having a plurality of balls, and having a ball raceor tread formed on the die by which the balls are carried. This detail also shows the ore feeding means to the balls. roll or rotor ring shoe and die, and also the lifting means consisting of ribs or extensionplates, and the discharging means for unloading the product when the ore, rock or material is pulverized, and

carried up or elevated for discharging.

Fig. 17 is a side view of the roll or rotor ring, shoe shown in Figs. 15 and 16, showing the feed and discharge openings at the side,

and the ribs or extension plates and pockets,

for the delivery of the product which is finely pulverized, to the discharge tube.

In some of the different types of grinding mills now in use the working or grinding parts are very greatly out of balance, requiring a large excess amount of power to start the mill, overthe amount of power required, when it has attained its proper speed when in operation. So that a comparatively large engine is requiredin this case, which necessarily is more expensive in cost of installationand up-keep.

In starting up that type of grinding mill which is greatly out of balance, the torque strain is very great on its gudgeons and bearings, causing considerable breakage.

The gearing and belts, gudgeons and shafts,

must necessarily be made of a larger and of agreater driving surface, in order that they will bedurable and strong enough to start the mill in operation.

In .the starting up of some of the other grinding mills of a more uneven balance an electric motor is required having a very strong torque or pulling power said to amount to as much as 2&0 per cent excess torque action, and the motor is designed as such with the object in view of preventing the burning out of the armature when starting up the mill. It will befiseen that with an unaxial roll shoe being nearly in balance with the cylinder of the mill, that this con dition is avoided, V and so allowing of a motor of any'well known standard design.

The grinding parts such as balls and the like which are withinthat typeof grinding mill that is greatly out of balance and when once in operation onthe grinding of ores, rock or material, and when grinding wet,

' are exceedingly hard to start again after the load or charge of the ore is once set, b reason ofstoppage ofthe mill, so that the balls or like grinding parts with the int/ermixed material, when the mill isstarted up again, causes an excessive torque action, and which at times causes a considerablebreakage to that type of mill, it also requires excess power, and an over plusbearing surface which is necessary for the driving of the mill.

In that type of over-balanced grinding mill using a multiplicity of balls of various sizes mostly all located in the mill and below the center line of axis, the wear is naturally towards excess, by reason of the greatercom parative weight of the ball, over that qf the mills is necessarily high, by reason of the excessive wear of balls and screens.

My invention relates to {1, con'iparatively high speed grinding mill, in which a roll or rotor ring shoe or series of rolls or rotor ring shoes is used within a grinding mill, said roll or rotor ring'shoe having no fixed orv established mechanical axis, being driven firstly by the surface of the die within the grinding mill, which is in contact with the outer surfaceof the roll or rotor ring shoe, and thereafter, in conjunction with the ore or rock or material, as it is fed'into the interior of the mill, or, inv other words, by the surface of the die within the mill, through the ore, rock or other material, to the surface of the roll or rotor ringshoe, or a serles of rolls or rotor rlng shoes.

My invention also relates to that type of mill which is nearly always in balance, as it will be seen, that the centre or axis of the roll or rotor ring shoe is nearly on, or in relation to, the operating centre of drum, by which the die is carried, so that, this eliminates the unnecessary torque which causes the breakage, as is so common in other mills, when starting, and then in operation.

It will. also be seen that the roll or rotor ring shoe when it is slightly in movement, and when starting or operating the mill, will act as an agitator or stirrer, and will at once relieve the charge of ore or rock from its quiescent and compact state, and put it into a live and disassociable state, particularly so when the mill is pulverizing wet.

It will also be seen that, in the feeding and pulverizing of ores of my type of mill,

whether.pulverizing wet or dry, that I ob tain a maximum wearing or crushing surface on the ore, rock or material, by reason of the inner surface of the die being in natural and direct contact with the ore, rock or material, when the surface of the roll or rotor ring shoe is in movement or in rotation with the mill.

in my invention I have also shown a means by which the pulverized product can be raised or elevated, when in suspension within the mill, and by its own mechanical crushing means, when the mill is in operation and grinding the ore, rock or other material. The ore being ground by the exterior surface of the roll or rotor ring shoe, and then the crushed or pulverized product which is held in suspension within the roll 0 1 rotor ring shoe, is elevated or carried up by the vanes, pockets or the like, which are located in or on the interior surface of the roll, or rotor ring shoe, and this product so raised. is then unloaded or deposited, on, or into the helical discharge screw or tube of mill, so that it can be quickly carried out of the mill, and so conveyed to any type of screens, hydraulic classifiers, tanks or the like, for any after treatment which may be neces sary.

'l have also shown by this invention, a means whereby friction rolls or balls may be used between the roll or rotor ring shoe and the ring die, and thereby causing a. lesser friction in the operation of the grinding mill on ores, rock or material, as well as giying a greatly increased capacity .lhe present invention consists of a cylinder or drum, formed by heads 1 and 2 and shell 3 and 4-, fastened by bolts (4, b and c.

To the shell 3 and 1 is fastened a ring die of a good wearing material, and prefer ably mane in sections, and fastened by the bolts 6. The side liners 7 also made of a good wearing material are preferably made in sections, being fastened to'heads 1 and 2 by bolts 8.

On the tubular extensions 9 and 10 of heads 1 and 2, respectively, bearings 9 and 1O are turned to suit bearing blocke 11 and 12, respectively, these bearing blocks may be of the ball and socket type as shown at 13, or of any other adaptable type, and ma have an extended base plate 11 and 12 as shown. On the tubular extension 10, is fastened a circular discharge lip 1 1, by bolts 15. A discharge tube 16 having in its interior a circular projection or flight 17, formed to act as a conveyor and used to quickly convey and discharge or unload the pulverized ore, rock or other material from the mill after pulverization. It is removably fastened to tubular extension 10 of head 2 by a circular flange 18 erected around the exterior of discharge tube 16 and having holes therein. so that it may engage with bolts 15, and so be rigidly held in place at the end and between tubular extension 10 and discharge lip 1d by said bolts 15. i

The projection 0r flight 17 which constitutes the conveyor can be made of a direction suitable to the operating direction of the mill. As the mill shown. in Fig. 3 is arranged tooperate against the hands of a watch, the projections or flights 1? could be arranged left-hand in order that the pulverized product would be discharged outwardly of the mill.

On the tubular extension 9 of head 1 is arranged and fastened driving gear 18 of a suitable design for driving the mill; instead of this gear 18, a pulley or other device (not shown), could be used to take the place of this gear 18, when it should be necessary or more feasible to drive direct, as the mill being nearly in balance, could be so operated.

under certain conditions, thereby dispense ing with the gear pinion l9 and its drive mechanism, consisting of shaft 19, pulleys 19 with bearing blocks 19, pulleys 19* are of the tight and loose pattern when this driving gear is so used.

The bearing blocks 11 and 12 are fastened to base plates 11 and 12" by bolts 11 and, 12 while the bearing blocks 19 of shaft 19 are preferably fastened to the same base plates by bolts 19. The base plates 11 and 12 are preferably fastened to concrete as I have shown by the foundation bolts 11 and 12", but this type of grinding mill could also be fastened to timber, as the strain or torque lines are greatly eliminated.

A mechanical scoop or spiral feeder 20 made with one, two, or three intake openings is fastened to the tubular extension 9 of head 1 by bolt-s21 and in practically the same manner as discharge lip is fastened to the tubular extension 10.

A delivery'tube 22 having in its interior a circular projection or flight 23 formed as a conveyor, and used to quickly convey the ore, rock or material to the interior of the &

mill, to be pulverized; this delivery tube 22 isalso removably fastened to, and between the tubular extension 9 on head land mechanical scoop or spiral feeder 20, by bolts 21,.in the same manner as the discharge tube 16is fastened. A suitable delivery box 24 is placedfor the receiving of the coarse'ore rock or material to be pulverized, and so formed that the mechanical scoop or spiral posed to each other as shown at 30 and 31,

feeder 20 can be easily and quickly loaded with the ore rock or material, to be delivered: to the delivery tube 22 having the proper conveyorflights 23 therein of a proper hand or helix, so that the crushed ore rock or material may be quickly delivered to the interior of the grinding mill for necessary pulverization. r 7

Within the drum or cylinder of the grinding mill comprising the heads 1 and 2, shell and 4-, and ring die 5, and their companion Jarts is nlaced a roll or rotor rin shoe 25 which is unaxial, or, in other words, without a stationary axis, this roll or rotor r1ng shoe 25 having a circumference or periphcry 26 of aless surface than the circumference or internal peripheralsurface 27, which is the inner wearingsurface of the ring (lie 5. To place this. roll. or rotor ring shoe 25, bolts a, Z) and-care removed, and a proper tackle or lifting means is applied, by engaging with lifting eye 28 on shell 3, and to which is fastened the sectional parts of the ring die 5 by bolts-6 or any other well known means of fastening or interlocking the oint of ring die 5 when made'jin sections, and which is preferably parted in conjunction with the oint line'29 of shell 3 and 4.

As the external or outside diameter 26 of roll or rotor ring shoe 25 is less than the internal diameter. 27 of ring die 5, it will be seen that the centres are unlike or opthat shown at 30 being the centre of the surfaceof ring die 5 and the drum or cylinder, while that shown at 31 being the unaxial centre of the roll or rotor ring shoe In general practice these centres 30 and 31 may be arranged comparatively closer or nearer to each other than that shown, should it be necessary.

Feed oi ae'nings 32 are formed from the inner surface of this roll or rotor ring shoe 25 tov the outer surface 26 as shown in Fig. 3, these openings are made to suit the condition of'operation and the direction of within the mill. I have shown one type of opening in Fig. 3, this feed opening 32 which is used to distribute the ore, rock or material to the contact or pulverizing surface between roll or rotor ring shoe 25,

and die surface 27,. isshown with a longitu= dinal or elongated opening in the length of the roll or rotor ring shoe, and having a r hopper like inlet 32 for part of the depth of theopening, and then an expanded or vfrom the mill, reversing side for side and then replacing, and then the mill; could be run in the opposite direction or with the hands of a watch,with the same eiiiciency. The alternate feed openings 34 are shown opposed or in opposition or staggered to the feed openings 32 in order that the ore rock or material may be more evenly distributed through this roll or rotor ring shoe 25 to the die to be pulverized.

It will be seen that this roll or rotor ring shoe 25 when in operation within the mill when crushing ore rock or material will be unaXial or without stationary axis, or in other words will constantly change its axis depending on the charge of ore, the feeding of the ore through the openings 32. and the hardness of said ore rock or material.

The centre of gravities of grinding mill with the ring die 5 and of the roll or rotor ring shoe 25 will be so near equal, that the power necessary to start this type of mill, .will be very nearly the same as when in operation, it being seen, that while there is a considerable weight in roll or rotor ring shoe 25, that nearly one-half of that weight is practically on top, or on the opposite side of the centre line 30 of mill.

, It will also be seen, that, with a slight circular movement of the mill, that the ore I rock or material which is within, if wet, will conical or rizzly like or diagonal to insure easy discharge, or these openings could be,

.as shown in Fig. 4;, Fig. 6 and Fig. 7. travel ofthe roll. or rotor r1ng shoe 25 The roll or rotor ring shoe 25 could be free from. opening if found necessary, when operating on certain types of ore rock and material, as I have shown at- 25 of Fig. 5," (the ring not being drawn in section) by so decreasing its width in its relation to the distance between the side liners 7 of the mill shown in Figures 2 and 3, and thereby allowing the ore rock or material to be fed along the sides of this roll or rotor ring shoe as at 25, or, the roll or rotor ring shoe 25 could be made very nearly the same width, as between side liners 7, as shown in Figures 2 and 3, by having feed openings 36 located around the outer face of roll or rotor ring shoe25, so that, in this case, with the roll or rotor ring shoe 25 shown plain as in 25 of Fig. 5 or as described, with the feed openings 36 shown in Fig. 2, a charge of spherical balls or any other shape material such as scrap metal, or

short pieces of shafting or any other material, or, flint pebbles could be used in conjunction with the roll or rotor ring shoe 25, or 25 in the mill, by so feeding them into that inner area and upon surface 37, when the shell 3 is removed, or, they could be fed in the ordinary manner through the mechanical scoop or spiral feeder 20 andto the delivery tube 22 and in the same manner in which the ore, rock or material is fed, so that, both the inner periphery and outer periphery of the practically balanced roll or rotor ring shoe 25 could be utilized, for the pulverizing of the ore rock or other material which is fed to the mill.

In Figs. 2, 3, 4i, 5, 6, and 7, I have shown a single roll or rotor ring shoe, but 1 do not wish to confine myself to a single roll or rotor ring shoe, as a plurality or multiplicity of these rolls could be used side by side if necessary and in the same manner as 1 have described.

As the inner circumference 27 of the wearing surface of the ring. die 5 is greater than the outer wearing circumference 26 of the roll or rotor ring shoe 25 it will also he seen that both wearing surfaces will change their position at every revolution of the mill. In fact, these surfaces. by reason of being concave and convex will constantly rub with each other on the ore, roclr or other material, and so tend to speed its pulverization there-- by giving a subsequent large capacity.

As the mill in its operation will be nearly in balance it will be also seen that its number of revolutions or its speed can be con siderably greater, than in that of an un balanced mill.

In Fig. i I have shown a roll or rotor ring shoe 25 as having circular grinding shoes 38 connected by side walls 39, the face 10 of this shoe acting as a flight or shelf or bucket, for carrying up the finely pulverized prodnot and discharging same upon and into the discharge tube 16 which is fitted with. an internal projection of a design suitable, one of the designs of which I have shown at 41 of Fig. 7 and Fig. 8. The finely pulverized product when discharged upon this internal projection 11, of the discharge tube 16, will fall in the diametrically and helically slotted way 42, and beso deposited upon the inner surface of this helical screw conveyor so adapted to act as a discharge launderias at 13, and the pulverized product so carried quickly into that part of discharge tube 16, at its point of connection which is better shown at 14C of Fig. 7.

The tube 16 being auxiliary to the discharge tube 16 is used as a carrier for the T shaped internal launder or helical screw conveyor as shown at 41' and 4:8 with helical opening or slotted way as at 42, and with a turned up flange as shown at 13 which acts as a retainer when conveying the pulverized product to discharge tube 16. The tube 16 could also be perforated if found necessary in order that the pulverized product would be more quickly delivered to discharge tube 16 as it would also fulfil the oiiice of carrier of the pulverized product to the discharge tube 16. v

In the placing of the roll or rotor ring shoe 25, or, when placing its renewal, and when the delivery tube 22 and discharge tube 16 project inwardly as shown in 7, 8, and 10, it will be necessary that the circular discharge lip 14 is first removed, and then the discharge tube 16 is drawn outwardly and sufiiciently, for the removal of the old roll or rotor ring shoe 25 and the placing ofa renewal or new roll or rotor ring shoe 25.

The delivery tube 22 could also project inwardly and within the roll or rotor ring shoe 25 if it should be found necessary, and so also be removed, when found necessary, by removing mechanical scoop or soiral feeder 20 from the tubular extension 9, and in the same manner as the discharge tube 16 is withdrawn.

In Fig. 6 l have showntho roll or rotor ring shoe 25 connected in the same manner as shown and described in that of F i, but, on the inner surface I have. shown lifting vanes, projections, flights or extensions 15 having an angle 1-6 and -17 to constitute a bucket groove or receptacle, for the delivery of the finely crushed product up and above the tubular opening 48 within which the discharge tube 16, and delivery tube 22, is placed, so that, these buckets, grooves or receptacles will carry up the finely pulverized material, and dump or discharge same at proper position or angle upon the inner projecting end of discharge tube 16 to be so carried outwardly of the mill as l have previously described. These buckets, grooves or receptacles can be made of various shapes and designs, to accomplish the purpose heretofore explained, others of which I have shown in Figs. 9, 10, 15 and 16. I, however, do not limit myself to these shapes or designs, as other practical shapes could also be used to suit the condition, and to give the same result.

The roll or rotor ring shoe 25 shown in Fig. 7 is drawn in section on the line 11-1) of Fig. 6 and showing the feedopenings differently disposed in their relation to each other, as shown by dotted lines 49 and 50, said numbers 4:9;and to correspond with the same numbers as I have shown, inFig. 6. In'the Figs. 2, 3, 4, 5, 6 and 7, I have shown a roll or rotor ring shoe 25 of various designs, but they are all bearing upon this same principle of crushing ores, rock or like materials,between the concave surface of the ring die 5, and the convex surface of the roll or rotor ring shoe 25 or 25*, and I am aware, and do assert that this principle can be embodied into a still more frictionlessdevice, and thereby giving a' still greater amount of wearing surface, by which the ore rock or material may be pulverized,and, so increasing its efficiency, capacity and utility in a given space, and, this I have shown by serveral modifications as in Figs. 9, 10, 15, 16 and 17 and, also with various kinds of rollers which may be used as shown in, vFigs. 11,12, 18 and 14.

Infthe Figs. 9 and 10, I illustrate and show the roll or rOtOr ring shoe as at 25, and the die 5', of the mill with a plurality of double conical rollers 51 arranged therebetween, and which, and in conjunction with the roll or rotor ring shoe 25 and die 5", asshown in Figs. 9 and 10, comprises the mechanism by which the ore, rock or mate rial is pulverized with less friction.

a certain distance of the mill, and the dis' charge tube 16 as likewise shown, this may be modified however to suit certain conditions. Y s

In Fig. 11 is shown a roller 52- having smaller diametrical extensions 53 by which a plurality of-these rollers could be connected 'to side walls similar to that shown at '39 of Fig. 4:. Plate 39 then. having bear mg eyes or holes to accommodate diametrical extensions 53. v

I Fig. 12 is an endview of roller shown in s I-have shown the unaxial centre 31., or, w1thout a would then have straight wearing or contact faces as shown 1n Fig. 5.

Fig. 14 is an end view ofroller shown in Fig. 13. r

In Figs. 15, 16 I have shown the roll or rotor ring 25 and the die 5 of the mill arranged with a plurality of balls 54. I have shown the die 5 made in four sections, this could be made, however, in more or less sections if necessary;

As shown in Figs. 15, 16 andl'Z, the ore rock or material is carried into the mill in the ordinary manner, through and by means of the delivery tube 22, and it then passes into the interior of roll or rotor ring shoe 25,"and from there through feed and dis charge openings 55, at each side of roll, and then down an inclined clearance passage 56,

to and between the plurality of balls 54-, and i the ball face or tread 57 of the roll or rotor ring shoe 25, and the ball race or. tread 58 of the die 5, to be pulverized.

The ribs or extension plates 59 with pockets 60 within the roller rotor ring-shoe 25, are, as I have previously explained, for the carrying anddelivery of the finelypul verized product, up and-to the discharge tube 16 which may be located as shown, or projecting inwardly of the mill, as I have also shown in Figs 7, 8 and 10.

The double-conical rollers 51, and the balls 54, or any rollers or like friction and pulverizing devices, some of which I have shown or described could be placed within the mill and in the same manner as the roll or rotorring shoe 25, 25, 25 or 25are placed, or, a special feed hole, with its cover and appurtenances, could be arranged on either heads 1 and 2 or shell 3 and 4c.

Ore rock or material is fed in the same manner to the roll or rotor ring shoe 25 of Figs. 9 and 10 by and through the de livery tube 22 andthen through feed jopenings 55? or side openings 55 to be pulverized between the double conical roller 51 and the roller face or tread '61 of the roll or rotor ring shoe 25 and the roll race or tread 62 of the roll die5 It is to-be understood that the construction which Ihave illustrated and disclosed herein is illustrative merely and that it is not restrictive; and that the invention may be embodied in otlierforms; for example, the roll or rotori'ing shoe, being 11l1fl/Xl2ll,-. can be changed into various shapes in order that the orerock oi material may be pulverized and elevated for a quick discharge, and with a die suitable, The discharge tube could also have many other and various changes in form and construction, while the die could'also be arranged in plurality when a plurality. of rolls or rotor ring shoes are used, all without departing' from the spirit of this invention. Having thus described my invention fill what I claim as new and desire to secure by Letters Patent is:

1. In a pulverizing mill having an operating cylinder with hollow bearing means, the combination of a flat surface rotor ring shoe having curved feed and discharge openings therein formed from the inner surface of rotor ring shoe to the outer flat surface of rotor ringshoe, a ring die surrounding the rotor ring shoe with flat die surface of a greater diameter than the outer flat surface of rotor ring shoe, thering die removably fastened to cylinder of mill bearing, means for supporting and operating the cylinder of the mill, means for feeding the rock ores or like material through the bearing means for supporting operating cylinder to the feed openings in rotor ring shoe, and means for discharging the pulverized product from the mill through the other bearing means for supporting the operating cylinder.

2. In a pulverizing mill, the combination of a rotor ring shoe, with a plain pulverizing face, a ring die surrounding the rotor ring shoe having a corresponding plain pulverizing face, the diameter of the pulverizing face of the ring die being of a greater diameter than the pulverizing face of the rotor ring shoe, means for feeding the rock, ore or like material between the pulverizing faces of rotor ring shoe and the ring die, means for discharging the product from betweenthe pulverizing faces of rotor ring shoe and the ring die, the ring die fastened to the cylinder of mill,- and means for operating the cylinder of mill.

3. In a grinding mill, the combination of an unaxial rotor ring shoe having curved feeding and discharging openings therein by which the reel: ore or material is delivcred to or discharged from the pulverizing face of the rotor ring shoe, a ring die having an inner wearing face to correspond with the pulverizing face of the rotor ring shoe but of a greater diameter, means for fastening the ring die to the cylinder of mill, and means for operating mill cylinder.

In a grinding mill, the combination of a cylinder, adie fastened therein having a plain pulverizing face, an unaxial rotor ring shoe with a corresponding plain pulverising'face through its periphery and provided with curved passages for feeding the ore rock or material from the inner face of rotor ring shoe to the outer pulverizing face of the rotor ring shoe, means for returning the pulverized rock ore or material from the outer pulverizing face of rotor ring shoe to the inner face of rotor ring shoe, means for discharging the pulverized rock ore or material from the cylinder, means for supporting the cylinder, and means for operatin the cylinder, die and rotor ring shoe.

5. In a grinding mill, the combination of a cylinder having a ring die therein, tubular trunnions on said cylinder, a freely rotating ring shoe having a plain contact surface engaging with said die, and having openings through its periphery, means for feeding material into said cylinder through one of said trunnions and means extending into said cylinder and in the other trunnion for discharging the pulverized material from the cylinder.

6. In a grinding mill, a cylinder formed sectional, and having exteriorly formed removing and lifting means, heads with tubular extensions formed for bearings and fastened to cylinder, means within the tubular extensions for delivering and discharging the ore rock or material to be pulverized, directly to or from any desig nated point of the interior ofthe cylinder, bearing, blocks adapted for bearings, a die fastened axially to and within the cylinder, and adapted to engage and drive an unaXial roll or rotor ring shoe, an unaxial roll or rotor ring shoe having curved feed ing and discharge passage ways located therein, said roll or rotorring shoe arranged within the dieand to be driven by the die, and means for revolvably operating the cylinder.

7. In a grinding mill having a longitudinal sectionally formed cylinder provided. with separating and lifting means, heads fastened to cylinder having tubular bearing extensions, a die fastened to the interior of the cylinder having plain grinding face, an unaXial roll or rotor ring shoe having an exterior plain grinding surface with curved circular feeding means arranged therein by which the ore rock or material. can pass from the interior surface of the unaxial roll to the exterior plain outer grinding surface, means within one of the tubular bearing extensions for delivering the ore rock or material directly within the inner surface of the unaxial roll and onto the curved circular feeding means arranged within the unaxial roll so that the ore may be distributed evenly to the exterior plain grinding surface of the unaxial roll, and onto the grinding die, the unaxial roll of a lesser outer diameter than the inner diameter of the plain grinding face of the die, and provided with curved feeding means which are used conunctively for discharging and elevating the pulverized material so that it may be discharged, means for operating the feeding, grinding, distributing, elevating and discharging means.

8. In combination with a grinding inill' rotatable about an axis and provided with intake and discharge openings, said mill being formed of a sectional formed cylinder, asectional formed grinding die fastened within the cylinder having a plain contact or grinding face, an unaxial roll or rotor ring shoe having a plain exterior grinding face to contact the internal or grinding face of the grinding die, curved means for feeding the ore rock or material to be pulverized to and between the grinding face of die and unaxial roll or rotor ring shoe, conveying and unloading means projecting thron the discharge opening and longitudinally within the interior of grinding mill, and means for operating the mill, rotatably around and with the axis, ,for feeding pulverizing and discharging the pulverized ore rock or material.

9. In combination with a grinding mill rotatable about an axis and provided with intake anddischarge openings, having a sec tionally formed cylinder and a, sectionally formed grinding die fastened to and within the'cylinder, anunaxial roll or rotor ring 'and the replacing of renewal parts,v a die removably fastened within the cylinder, a roll or rotor ring shoe having curved feed openings and elevator lifting means placed within the cylinder to co-act with the face of "the die, curved feeding means for delivering the material to be pulverized to and between the grinding face of the roll and the grinding face of the die,e1evating means for delivering the pulverized product to the spiral discharge Opening, and means for I operating the grinding mill rotatably around t e axls. I 11.111 a grinding mill, the comblnation of a cylinderv and a die removablyfastened I to the cylinder, a plain faced unaxial roll within the cylinder having curved feeding and discharging means for feeding the rock ormaterial through the roll and to the die, curved and elevating meansfor discharging the pulverized product from the plain face of the unaxial. roll and the grinding face of the die, means for discharging the pulverized product from the cylinder, and means for operating the cylinder. v

12. In a grinding mill, the combinationof a revolving cylinder having a .plainfaced grinding die therein, the plain faced contactsurface of said grinding die in driving 7 contact to (11313111 faced unaxial roll, a plain faced unaxial roll having the horizontal center of said unaxial roll disposed so that the periphery of the-said-unaxial roll passes around and above the horizontal center of the revolving cylinder and, to engage in driving contact with the, plain faced surface of the grinding die 'and having curved means for feedingand discharging thematerial to and between the contact surface of the unaxial roll and the contact surface of the die, means for feedin the material to be pulverized, discharge 'tu be means for cola lecting and discharging the material when' pulverized, and means for revolving the I cylinder of mill. v In testimony whereof I afiir; my signature in the presence oftwo witnesses. v j Hi MOYLE.

Witnessesz I A. B. BREWSTER,

N. L. PERRY. v 

